Quandaries
and Queries
how they got (4x+5)(4x-5) from
16x2+20x-12x-15=4x(4x+5)-3(4x+5)=(4x+5)(4x-5)
Hi Tanya,
I agree with the first step
16x2+20x-12x-15 = 4x(4x+5)-3(4x+5)
At this point you need to see the common factor 4x+5. Hence I get
4x(4x+5)-3(4x+5) = (4x+5)(4x-3)
Penny