Answer Key 7.3
- 9×8=72
9+8=17
p2+9p+8p+72
p(p+9)+8(p+9)
(p+9)(p+8) - 9×−8=−72
9+−8=1
x2+9x−8x−72
x(x+9)−8(x+9)
(x+9)(x−8) - −8×−1=8
−8+−1=−9
n2−n−8n+8
n(n−1)−8(n−1)
(n−1)(n−8) - 6×−5=−30
6+−5=1
x2+6x−5x−30
x(x+6)−5(x+6)
(x+6)(x−5) - −10×1=−10
−10+1=−9
x2−10x+x−10
x(x−10)+1(x−10)
(x−10)(x+1) - 8×5=40
8+5=13
x2+8x+5x+40
x(x+8)+5(x+8)
(x+8)(x+5) - 4×8=32
4+8=12
b2+4b+8b+32
b(b+4)+8(b+4)
(b+4)(b+8) - −7×−10=70
−7+−10=−17
b2−7b−10b+70
b(b−7)−10(b−7)
(b−7)(b−10) - −3×−5=15
−3+−5=−8
u2−3uv−5uv+15v2
u(u−3v)−5v(u−3v)
(u−3v)(u−5v) - −8×5=−40
−8+5=−3
m2−8mn+5mn−40n2
m(m−8n)+5n(m−8n)
(m−8n)(m+5n) - 4×−2=−8
4+−2=2
m2+4mn−2mn−8n2
m(m+4n)−2n(m+4n)
(m+4n)(m−2n) - 8×2=16
8+2=10
x2+8xy+2xy+16y2
x(x+8y)+2y(x+8y)
(x+8y)(x+2y) - −9×−2=18
−9+−2=−11
x2−9xy−2xy+18y2
x(x−9y)−2y(x−9y)
(x−9y)(x−2y) - −2×−7=14
−2+−7=−9
u2−2uv−7uv+14v2
u(u−2v)−7v(u−2v)
(u−2v)(u−7v) - 4×−3=−12
4+−3=1
x2+4xy−3xy−12y2
x(x+4y)−3y(x+4y)
(x+4y)(x−3y) - 5×9=45
5+9=14
x2+5xy+9xy+45y2
x(x+5y)+9y(x+5y)
(x+5y)(x+9y)
