section 9.5 - difference of squares

Section 9.5- Difference of Squares

review:
multiply- (2x+7)(2x-7)
= 4x^2-49

Difference of Squares
a^2-b^2=(a-b)(a+b)

a^2+b^2= PRIME

EX: factor:
9p^2-25
(3p+5)(3p-5)


EX2: 16x^2-121y^2
(4x-11y)(4x+11y)


EX3: 8p^2-98pq^2
2p(4p^2-49q^2)
2p(2p-7q)(2p+7q)


EX4: x^2+9
PRIME


EX5: 196m^4-289n^10
(14m^2-17n^5)(14m^2+17n^5)