SOLUTION: The instructions say solve each equation by factoring, by taking square roots, or by graphing. When necessary,round your answer to the nearest hundredth. The first problem is x^

Algebra.Com
Question 536598: The instructions say solve each equation by factoring, by taking square roots, or by graphing. When necessary,round your answer to the nearest hundredth.
The first problem is x^2-18x-40=0
Found 2 solutions by Alan3354, fcabanski:
Answer by Alan3354(69443)   (Show Source): You can put this solution on YOUR website!
Hint: You can factor that one.
Answer by fcabanski(1391)   (Show Source): You can put this solution on YOUR website!
Check if it can be factored with reverse FOIL.


Can you find factors of -40 that when added = -18?


Factors of -40 are -40 and 1, -20 and 2, -10 and 4, -5 and 8 and the same factor pairs with the signs switched (40 and -1, for example). Look at -20 and 2. -20+2 = -18. Those factors work.


(x-20)(x+2)=0


By the 0 product rule, set each =0 and solve for x.


x-20=0 (Add 20 to both sides.) x=20


x+2=0 (Subtract 2 from both sides.) x=-2.

If you need help understanding math so you can solve these problems yourself, then one on one online tutoring is the answer ($30/hr). If you need faster solutions with guaranteed detailed answers, then go with personal problem solving ($3.50-$5.50 per problem). Contact me at fcabanski@hotmail.com


RELATED QUESTIONS

I have a question where it asks me to solve an quation x^2 -2=7 using the indicated... (answered by josgarithmetic)
The instructions say to solve by factoring. x²+13x=-42. There are supposed to be two... (answered by ewatrrr)
Solve equation by taking square roots. 2x^2 - 7 =... (answered by oberobic)
Solve each equation by factoring or taking square roots. 1.) x^2 - 7x = 0 2.) x^2 + (answered by EMStelley,stanbon)
x^+85=18x solve by any method ( factoring, extracting square roots, or completing the... (answered by Fombitz)
how do i solve -x^2-4=18 by graphing, factoring,square roots,completing the square, and... (answered by josmiceli)
Solve the equation by either factoring or taking square roots. {{{ x^2-4x=0 }}} I'm a... (answered by Alan3354)
solve by taking the square roots:... (answered by mananth)
The directions say to; Solve each equation by graphing. If integral roots cannot be... (answered by Mathtut)