Question

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Answer 1

1.
400 - m^2 = (20 - m)(20 + m)

2.
4x^2 - 25 = (2x-5)(2x+5)

3.
2 7/9t^2 -1 = (5/3t - 1)( 5/3t+1)

4.
16a^4 - 81 = (4a^2 -9)(4a^2 +9)

5.
(x+1)^2 -16 = (x+1 -4)(x+1+4) = (x-3)(x+5)

6.
a^2 -12 a + 36 = (a - 6)^2

7.
16m^2 +24mn  +9n^2 = (4m+3n)^2