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10a = 5
a = 5/10 = ½
b) x² + 15x = 0
x(x + 15) = 0
c) 6m² + 8mn - 10m
2m(3m + 4n - 5)
d) 25x² - 16y²
=(5x - 4y)(5x + 4y)
e) x² + 8x + 16
= (x + 4)(x + 4)
f) x² - 10x + 25
=(x - 5)(x - 5)