Question

factor by splitting middle term
1. X²-11x- 42
2. X²-12x- 45
3. 3X²+ 14x +8​

Answer 1

Answer:

1) x²-11x-42

=x²-(14-3)x-42

=x²-14x+3x-42

=x(x-14)+3(x-14)

=(x-14)(x+3)

2)x²-12x-45

=x²-(15-3)x-45

=x²-15x+3x-45

=x(x-15)+3(x-15)

=(x-15)(x+3)

3)3x²+14x+8

=3x²+(12+2)x+8

=3x²+12x+2x+8

=3x(x+4)+2(x+4)

=(x+4)(3x+2)

Answer 2

Answer:

x^2-11x-42

x^2-14x+3x-42

x(x-14)+3(x-14)

(x-14)(x+3)

2.

x^2-12x-45

x^2-15x+3x-45

x(x-15)+3(x-15)

(x-15)(x+3)

3.

3x^2+14x+8

3x^2+12x+2x+8

3x(x+4)+2(x+4)

(x+4)(3x+2)