I’m having trouble with these problems #2 and #3

Im not 100% sure but the answer is 25x^6+40x^3+16

Step-by-step explanation:

(5^3+4)^2

(5x^{3}+4)^{2}

(5x3+4)2

(5^3+4)(5^3+4)

5(5x^3+4) *x^3+4(5x^3+4)

5(53+4)⋅3+4(53+4)+4(5x^{3}+4)

5(5x3+4)⋅x3+4(5x3+4)256+203+4(53+4)

Overall the answer is 25x^6+40x^3+16

x = ± 6i

step-by-step explanation:

x^2 = -36

take the square root of each side

sqrt(x^2) = sqrt(-36)

we know sqrt(ab) = sqrt(a) sqrt(b)

x = ±sqrt(36) sqrt(-1)

we know that sqrt (-1) = i

x = ± 6i

a; x = 0.5

step-by-step explanation:

-10x = -5

x = 0.5