Question

If a+b=4 and ab= -12 Find a-b or a2-b2​

Answer 1

Step-by-step explanation:

a²-b²=a²+b²+2ab

=(a+b)²+2(ab)

=(4)²+2(-12)

=16+(-24)

=16-24

= -8

hence,a²-b²= -8

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Answer 2

Answer:

a+b=4

=>a= 4-b

substitute a=4-b

=>(4-b)b = -12

=>b^2 -4b -12= 0

by solving the above quadratic eqn you get

=>b= -2 b=6

so b=-2 neglected

=>b=6

now

a+6=4

a= -2

so.

=>a-b

=>-2+6

=>4

and

a2-b2

=>-2×2+2×6

=>8

Step-by-step explanation:

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