SOLUTION: I need to know if these questions are correct thank you! 5.) Multiply (4a+x)(3a-x) I got 12a^2-ax-x^2 --- 7.) Multiply (x+3)^2 I got x^2+6x+9 ---- 9.) (2x^2)(x

Question 550689: I need to know if these questions are correct thank you!
5.) Multiply (4a+x)(3a-x)
I got 12a^2-ax-x^2
---
7.) Multiply (x+3)^2
I got x^2+6x+9
----
9.) (2x^2)(x+4)(x-4)
I got 2x^4-32x^2
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11.) To graphically solve the quadratic equation x^2+3x-10=5 you?
I got bring 5 to the left and set y=x^2+3x-15. Then find the roots of the graph.
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12.) If the garden box has dimensions of x by x feet and an area in square feet equal to the permermiter in feet what is the value for x that satisfies the requriements. The box is a sqaure.
I got x=4 feet.
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13.) Given three consecutive integers with a sum of four times the second number, write an algerbraic equation for this situation.
I got n + n + 1 + n+ 2 = 4(n+1)
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14.) Factor the trinomal b^2-b-6.
I got (b+3)(b-2)
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17.) Factor the equation x^2=x+20
I got (x-5)(x+4)
----
19.) Solve the equation 3m^2 + 6m =3 using the quadratic formula.
I got x=2.5 and -14.5
---
Thanks!
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
# 14 and # 19 are not correct.
The others are correct.
Cheers,
Stan H.
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