It means negative 42 times a certain number. x is a variable, you have to find x. Ex. if x is 1 then it would be -42 Multiplied by 1, which is -42.
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42x
It is: 42x+30x^2
7x = 42 Divide both sides by '7'. Hence x = 42/7 x = 6 The answer!!!!!
Factor out a 2. 2(x3 - 21x + 20) That factors to 2(x - 1)(x - 4)(x + 5) The roots are -5, 1 and 4