expand the following using identities.. (0.3x+3y)(0.3x-3y)
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(0.3x)² -(3y)²
0.9x² - 9y²
9x²/10 - 9y²=0
9x² - 90y² = 0 × 10
9x²=90y²
x²=10y²
or
x²-10y²=0
0.9x² - 9y²
9x²/10 - 9y²=0
9x² - 90y² = 0 × 10
9x²=90y²
x²=10y²
or
x²-10y²=0
ananya7541:
Thanks for your answer
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