State whether or not the expression is a
trinomial square. If it is, factorise the expression.
49x⁴- 112x²y² + 64y⁴
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Do as given
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49x^4 - 168x^2y^2 + 144y^4 = (7x^2) - 2(7x^2)(12y^2)+(12y^2) = (7x^2 - 12y^2)^2
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