<u>We know that (a + b)(a - b) = a² - b²:</u>
Answer: LCD = ( x + 1) (x - 1)
Joe has some pocket money. He spends 90% of it. He has fifty pence left. How much pocket money did he have?
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<u>We know that (a + b)(a - b) = a² - b²:</u>
Answer: LCD = ( x + 1) (x - 1)