(x-a) (x +a) = x^2 - a^2 .. then 6^2 - 5^2
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(6+5)(6-5) = 11...........
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Then type x=6. Try it now: 2x+3=15 @ x=6 Clickable Demo Try entering 2x+3=15 @ x=6 into the text box.
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