Question

please solve all four
step by step
by middle term splitting.
​

Answer 1

Answer:

here is youe answer

Step-by-step explanation:

i think your 3rd question is not correct

Answer 2

[1]

$x { }^{2} + 13 + 42 = 0 \\ x { }^{2} + 6x + 7x + 42 = 0 \\ x(x + 6) + 7(x + 6) = 0 \\ (x + 7)(x + 6) = 0 \\ x + 7 = 0 \: \: \: \: \: x + 6 = 0 \\ x = - 7 \: \: \: x = - 6$