SOLUTION: I left my notes at school. I don't know how to solve this problem
(3x+5)(7x-15)=180
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Question 1030479: I left my notes at school. I don't know how to solve this problem
(3x+5)(7x-15)=180
Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
(3x+5)(7x-15)=180
3x(7x-15)+5(7x-15)=180
21x^2-10x-255=0
Find the roots of the equation by quadratic formula
a= 21 b= -10 c= -255
b^2-4ac= 100 - -21420
b^2-4ac= 21520 = 146.7
x1=( 10 + 146.7 )/ 42
x1= 3.73
x2=( 10 -146.7 ) / 42
x2= -3.25
x = 3.73 or -3.25
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