Question

1 point
17. If x2 + mx – 28 = (x – 7)(x + 4), then m =
a)3
b) -3
d) -11
c) 11
O(A)
O (B)
O (C)
O (D)​

Answer 1

Step-by-step explanation:

To campare the equation the value of m is -3

Answer 2

Answer:

m=−3 so b) is the correct answer

Step-by-step explanation:

Let's solve for m.

x2+mx−28=(x−7)(x+4)

Step 1: Add -x^2 to both sides.

mx+x2−28+−x2=x2−3x−28+−x2

mx−28=−3x−28

Step 2: Add 28 to both sides.

mx−28+28=−3x−28+28

mx=−3x

Step 3: Divide both sides by x.

mx/x=−3x/x

m=−3