4 because:-
a = missing factor
4 x 7 x a = 28 x 4
28 x a = 112
a = 112/28
a = 4
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All the terms have 4x4 as a factor Then, 4x7 + 32x5 + 24x4 = 4x4(x3 + 8x + 6)
There's only one number that equals 28. The number is . . . . . wait for it . . . . . 28.
4x+3=9x-4+4 +44x+7=9x-4x -4x7=5x-------57/5=1.41.4=x
yes 4x7=28
1x28.....2x14....4x7