Plzz..tell 13 to 19 tomorrow is test...... Plzzz. ...I want them plz.....com
13) 2x4 - 32 # first step take common factors out
=2(x4 - 16)
=2((x2)2 -42) # a2 - b2 = (a+b)(a-b) a = x2 b = 4
=2(x2 - 42 )(x2 +4) # a2 - b2 = (a+b)(a-b) a = x b = 2
=2(x2 +4) (x +2)(x-2)
13 ii) a2(b+c) - (b+c)3
=(b+c)( a2 - (b+c)2 )
=(b+c)(a2 - ( b2 +a2 +2bc) )
=(b+c)(a2 - b2 - c2 - 2bc)
=2(x4 - 16)
=2((x2)2 -42) # a2 - b2 = (a+b)(a-b) a = x2 b = 4
=2(x2 - 42 )(x2 +4) # a2 - b2 = (a+b)(a-b) a = x b = 2
=2(x2 +4) (x +2)(x-2)
13 ii) a2(b+c) - (b+c)3
=(b+c)( a2 - (b+c)2 )
=(b+c)(a2 - ( b2 +a2 +2bc) )
=(b+c)(a2 - b2 - c2 - 2bc)