A rectangle has length (3x+5) cm and width (2x - 1) cm. What is the area of the rectangle?

1 answer:

6 0

I think is the answer is 345. Because the operation is 3X+5=2X-1 then the result of X you have to multiply and you got the result

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Step-by-step explanation:

$\text{The vertex form of a quadratic equation}\ f(x)=ax^2+bx+c:\\\\f(x)=a(x-h)^2+k\\\\(h,\ k)-\text{vertex}\\=====================================$

$\bold{METHOD\ 1:}\\\\\text{convert to the perfect square}\ (a+b)^2=a^2+2ab+b^2\qquad(*)\\\\f(x)=x^2+2x-3=\underbrace{x^2+2(x)(1)+1^2}_{(*)}-1^2-3\\\\f(x)=(x+1)^2-4\\==============================$

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Step-by-step explanation:

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