3 years ago

What is the answer to (8x+5)^2=63? I've been stuck on this problem for about 10 minutes now.

1 answer:

8 0

When the equation is squared, you have to foil (8x+5), so it becomes
(8x+5)(8x+5)=63

then you use the distributive property, so it become 64x^2 +40x +40x +25, and you simplify that into 64x^2+80x+25=63

next you subtract 63 from the left, sso it becomes 64x^2+80x-38=0
then you use the quadratic formula -b+/- (root b^2-4ac )/2a to solve for the zeros or x-values

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