Question

Simplify and tell the answer in step by step explanation and I will mark you as brilliant also​

Answer 1

Answer:

hey here is your answer

pls mark it as brainliest pls

Step-by-step explanation:

$so \: here \: \\ ( - 5p {}^{2} - 7q + r) {}^{2} \: ie \: (r - 7q - 5p {}^{2} ) {}^{2} \\ so \: here \: (r - 7q - 5p {}^{2} ) {}^{2} \: is \: in \: form \: (a - b - c) {}^{2} \\ so \: we \: know \: that \\ (a - b - c) {}^{2} = a {}^{2} + b {}^{2} + c {}^{2} - 2ab - 2ac - 2bc \\ thus \: then \: accordingly \\ (r - 7q - 5p {}^{2} ) {}^{2} = (r) {}^{2} + ( - 7q) {}^{2} + ( - 5p {}^{2} ) {}^{2} - 2r.( - 7q) - 2.r( - 5p {}^{2} ) - 2( - 7q)( - 5p {}^{2} ) \\ = r {}^{2} + 49q {}^{2} + 25p {}^{4} + 14qr + 10p {}^{2} r - (2 \times 35qp {}^{2} ) \\ = r {}^{2} + 49q {}^{2} + 25p {}^{4} + 14qr + 10p {}^{2} r - 70.qp {}^{2}$