4 Which of the following expressions is
equivalent to x2 + 2x – 15 ?
A (x + 2)(x – 7.5)
C (x – 3)(x + 5)
B (x + 3)(x - 5)
D none of these

(x-3)(x+5)

Step-by-step explanation:

(x-3)(x+5)

x^2 - 3x + 5x - 15

x^2 + 2x - 15

(x-3)(x+5)

Step-by-step explanation:

I put the expression onto a graphing calculator, then I put all of the answers onto the calculator and it was equal to the original expression. Hope this helps.

there are many solutions.

step-by-step explanation:

step 1: simplify both sides of the equation.

4x+6=4x^2+10x−4

step 2: subtract 4x^2+10x-4 from both sides.

4x+6−(4x^2+10x−4)=4x^2+10x−4−(4x^2+10x−4)

−4x^2−6x+10=0

step 3: factor left side of equation.

−2(2x+5)(x−1)=0

step 4: set factors equal to 0.

x=-5/2 or x=1