165=(x+3)(x+7)

Question

Find the Value of X

Answer 1

Hi King, start by multiplying the two binomials.

 

(x + 3) * (x + 7) = x² + 10x + 21

 

Then:

 

x² + 10x + 21 = 164

 

Subtract 164 from both sides:

 

x² + 10x - 144 = 0

 

There are several ways to solve at this point. You can factor or use the quadratic formula to solve for x.

 

questions?

Answer 2

165 = (x + 3)(x + 7)
165 = x² + 10x + 49

0 = x² + 10x - 116

 

Can you solve for x? (You might need the Quadratic Formula)