What are the solution(s) to the quadratic equation 40 - x2 = 0?
x= +2/10
x= +4/10
0
O
x = +2/5
0
x = +4/5

±2 sqrt(10) = x

Step-by-step explanation:

40 - x^2 =0

Add x^2 to each side

40 -x^2 + x^2 = 0+x^2

40 = x^2

Take the square root of each side

±sqrt(40) = sqrt(x^2)

±sqrt(40) = x

±sqrt(4*10) = x

We know the sqrt(ab) = sqrt(a) sqrt(b)

±sqrt(4) sqrt(10) = x

±2 sqrt(10) = x

the answer would be d

straight away you can eliminate a and c because not all books contain a scientific skill because some may be fiction. c is also wrong because it saids that the only way children can learn is through books which is incorrect.

b is also wrong because reading can be a scientific skill but not always, therefore it is wrong which leaves you with d, the correct answer since it said that it can children learn.

hope this ! : 3

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