Question

factorise z square - 4z - 77

Answer 1

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Answer 2

z square -4z-77=0
a=1
b=-4
c=-77
a*c=-77(multiplication of factors)
b= 4. (addition of factors)

factors=-11. and. 7
multiply
-11*7=-77
addition=
-11+7=-4

z square-11z+7z-77=0
z(z-11)+7(z-11)
z-11=0
z=11

and
z+7=0
z=-7



therefor z =11
and. z=-7




hope it helps
#/AJ#/