if a=4xy^-6xy+10xy^;b=16xy^+15xy-6x^y; c=xy-12xy^+4xy^ find 1.a+b+c 2.a-b 3.b-c
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Step-by-step explanation:
10a2 – 15b2 + 20c2 = (2 × 5 × a × a)
– (3 × 5 × b × b) + (2 × 2 × 5 × c × c)
= 5 × (2 × a × a – 3 × b × b + 4 × c × c)
= 5(2a2 – 3b2 + 4c2)
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