x-intercept: where y is equal to zero.
therefore:
0 = 42x^2 + 28x
0 = x(42x + 28)
x = 0 ; and
x = -28/42 = -2/3
x-int: (0,0) and (-2/3,0)
so there,, :)
X-intercept=-7&0
Y-intercept=0
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