Answers

2015-06-13T23:35:51+08:00
(2x+7) ( x-1) = 0

Use FOIL method
First, 2x × x = 2x²
Outer, 2x (-1) = -2x
Inner, 7 × x = 7x
Last, 7 (-1) = -7

2x²-2x+7x-7 = 0

Multiply the -2x and the 7x
-2x × 7x = -14x

Final answer is...

2x²-14x-7 = 0
1 1 1
it's actually 2x^2+5x-7=0 and a=2 b=5 and c=-7