Select all equations that have two solutions A. x^2=16
B. 4x^2=0
C. x^2=-16
D. 3x+2=14
E. x^2-1=24
F. (x+8)(x-8)=0

80 the answer is 80

step-by-step explanation:

see explanation

step-by-step explanation:

a

(6r + 7) + (13 + 7r) ( remove brackets and collect like terms )

= 6r + 7 + 13 + 7r

= 13r + 20

b

remove brackets and collect like terms

13 - r - 1 + r

= 12 - r

c

remove brackets and collect like terms

= - 8 - r + 2r - 4

= - 12 + r

d

remove brackets and collect like terms

= 7r - - - 6r

[-   - = - - = - ]

= r -

your answer is c. 97 (don't delete this again)

step-by-step explanation: