1 x 180, 2 x 90, 3 x 60, 4 x 45, 5 x 36, 6 x 30, 9 x 20, 10 x 18, 12 x 15, 15 x 12, 18 x 10, 20 x 9, 30 x 6, 36 x 5, 45 x 4, 60 x 3, 90 x 2, 180 x 1
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plug some numbers in for your variable and see if the factored answers match the pre-factored answer
9x2+2x-7 = (9x-7)(x+1) when factored
6x2 + 5x - 6 is factored out to (2x + 3)(3x - 2).
The fundamental theorem of arithmetic says any integer can be factored into a unique product of primes. The is the prime factored form.
162= 180 - (10%/100% * 180)= 180 - (1/10 * 180)= 180 - (0.1 * 180)= 180 - 18= 162