(a +b-c+d) (a+b+c-d)
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a^2+b^2–c^2–d^2+2ab+2cd
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uske baad cancel ho jayega
or jo reh jayega wo answer
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(a + b - c + d ) ( a + b + c - d)
= a^2 + ab + ac - ad +ab + b^2 + bc - bd - ca - cb - c^2 + cd + ad + bd + cd - d^2
= a^2 + b^2 - c^2 - d^2 + 2cd + 2ab
Hope it helps
= a^2 + ab + ac - ad +ab + b^2 + bc - bd - ca - cb - c^2 + cd + ad + bd + cd - d^2
= a^2 + b^2 - c^2 - d^2 + 2cd + 2ab
Hope it helps
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