Simplify the following expression: (x + 7)2 x2 + 14x + 49
x2 – 14x + 49
x2 + 49
x + 49

Multiply the binomials: (3x – 2)(3x + 2)

9x2
3x2 – 4
9x2 – 12x – 4
9x2 – 4

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Step-by-step explanation:

B AND D

(sin 42)/31. = sinx)/37

sinx = 37 (sin42)/31

= 37× 0.66/31 = 0.787

x= 51.9

other angle opposite to y = 180-51.9-42

= 180- 93.9 =86.1

so

sin42)/31 = sin 86.1)/y

0.021 = 0.997 /y

y= 0.997/0.021 =47.47