Oh, dude, you're hitting me with some math now? Alright, so 3c x d is just 3 times c times d. Like, you're just multiplying them all together, man. It's not rocket science, just basic algebra. So, yeah, that's your answer.
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d=3c
In mathematical terms, 3c times d can be represented as 3cd. This is the result of multiplying the coefficient 3 by the variables c and d. In algebra, when multiplying a number by a variable, the number is simply placed in front of the variable, indicating multiplication.
Transitive property of equality
X2+3x-6=0A=1B=3C=-6D=B2-4AC=32-4*1*-6=33X1= (-B+√D)/(2A)=(-3+√33)/(2*6)=1,372281323X2= (-B-√D)/(2A)=(-3-√33)/(2*6)=-4,372281323
This does not sound like an equation. This sounds like evaluating an algebraic expression. 3C means 3 times the value of C (which you have given as 21) then subtract 15. 3 x 21 - 15 = 48