Question

expand( 2a-5b-3c)^2 using suitable identity​

Answer 1

Answer:

4a²+25b²+9c²-20ab-30bc+12ca

Step-by-step explanation:

We know the algebraic identity,

(x+y+z)² = x²+y²+z²+2xy+2yz+2zx

Now,

(-2a + 5b-3c)²

= [(-2a) + 5b + (-3c)]²

= (-2a)²+(5b)²+(-3c)²+2(-2a)(5b)

+2(5b)(-3c)+2(-3c)(-2a)

= 4a²+25b²+9c²-20ab-30bc+12ca

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Answer 2

Answer:

4a^2+25b^2+9c^2-20ab+30bc-12ac