bjr
a.( 5 + 5z)² + 5z (2 + 5z) =
5² + 2*5*5z+ (5z)² + 5z*2 + 5z * 5z
25 + 50z + 25z² + 10z + 25z²
50x² + 60z + 20
b.( 5x + 7) (-7x + 3)
= 5x*(-7x) + 5x*3 + 7*(-7x) + 7*3
= -35x² + 15x - 49x + 21
= -35x² - 34z + 21
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bjr
a.( 5 + 5z)² + 5z (2 + 5z) =
5² + 2*5*5z+ (5z)² + 5z*2 + 5z * 5z
25 + 50z + 25z² + 10z + 25z²
50x² + 60z + 20
b.( 5x + 7) (-7x + 3)
= 5x*(-7x) + 5x*3 + 7*(-7x) + 7*3
= -35x² + 15x - 49x + 21
= -35x² - 34z + 21