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" 9) "a(a+b-c)-bc...

" 9) "a(a+b-c)-bc

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Factorise : a(a-2b-c)+2bc

Factorize each of the following expressions: 6ab-b^(2)+12ac-2bc,a(a+b-c)-bc

Add the following: a-b+ab , b-c+bc ,c-a+ac

Add the following: a-b+ab, b-c+bc, c-a + ac

Proof that (a+b+c)(bc+ca+ab)-abc=(b+c)(c+a)(a+b)

|[1, 1, 1], [a, b, c], [bc, ca, ab]| = (a-b)(b-c)(c-a)

Prove that: {:|(1,1,1),(a,b,c),(bc,ca,ab)| = (a-b)(b-c)(c-a)

Prove that Delta = |{:(1,,1,,1),(a,,b,,c),(bc+a^(2),,ac+b^(2),,ab+c^(2)):}| = 2(a-b)(b-c)(c-a)