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This is what we call a "difference of squares". Whenever you see a perfect square subtracted from another perfect square, this statement will be true:
a2 - b2 = (a + b)(a - b)
In this case, our perfect squares are x2 and one hundred, so this can be factored out as:
(x + 10)(x - 10)
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Can you Factorise x2-100?
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