(0.5x + 0.9y) (0.5x - 0.9y)
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Answered by
3
Answer:
(0.5x)²-(0.9x)²
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Answered by
15
(a+b) (a-b)
= a(a-b) + b(a-b)
= (a*a) - (a*b) + (b*a) - (b*b)
=a^2 - ab + ba - b^2
= a^2 - b^2
=(0.5x)^2 - (0.9y)^2
=0.25x^2-0.81y^2
=-0.56
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