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What is the value of x and y in 3x-y equals 21?
-18
What is the factor of this trinomial x2 plus 13x plus 42?
The easiest way to factor x2 + 13x + 42 is to look at the last number. The last number is 42. Now, think of what whole numbers you can multiply to equal 42. 1 x 42 2 x 21 3 x 14 6 x 7 If you look at the equation, we notice that the sign pattern is + + + When the sign pattern is + + +, we know that whatever two factors you choose must add up to the middle number, 13. So, automatically we can get rid of some of these factors. 1 x 42 --> 1 + 42 doesn't equal 13 2 x 21 --> 2 + 21 doesn't equal 13 3 x 14 --> 3 + 14 doesn't equal 13 Now, we're automatically left with 6 x 7. So, your answer would be (factored out), (x+6)(x+7) Where x = -7, -6
X over 5 equals 8 over 21 solve for x?
x/5 = 8/21 x = 8/21 * 5 x = 1.904761905
What is the answer to -12 equals x plus 9?
-12 = x+9 x+9 -9 = -12 -9 x = -21
Factor x squared - 4x - 21?
-17
