Question

Use the quadratic formula to solve x² + 7x + 8 = 0.

What are the solutions to the equation?

Round irrational solutions to the nearest tenth.




x=−7 and x=−1

x=−5.6 and x=−1.4

x=−8 and x = 1

x=−6.9and x=−0.15

Answer 1

Solution,

• x²+7x-8=0
• x²+8x-x-8=0
• x(x+8)-1(x+8)=0
• (x+8)(x-1)=0

Now,

Either,

x+8=0

x=-8

Or,

x-1=0

x=1

Answer 2

x=−5.6 and x=−1.4

Explanation: