Question

Q35 Write Expanded Form​

Answer 1

34)

105× 106

= (100+5)(100+6)

Using Identity, (x+a)(x+b) = x²+(a+b)x + ab

= (100)²+(5+6)100+6(5)

= 10000+1100+30

= 11,130

35)

(2a-b+c)²

= (2a+(-b)+c)²

Using Identity, (x+y+z)²= x²+y²+z²+2xy+2yz+2zx

= (2a)²+(-b)²+c²+2(2a)(-b)+2(-b)(c)+2(c)(2a)

= 4a²+b²+c²-4ab-2bc+4ac