Did I get the right answer for this? Evaluate the expression
3x squared - 5x when x= -2 My Answer is 46. I got this by doing 3 times -2 and squaring that and then multiplying 5 times -2 and subtracting that ( negative 10 ) from 36. Is this correct?
Im sorry but you did it wrong. Remember your order of operations. First do whats in parenthasis, so nothing then exponents. catch me first off is you will get this when you substitute in. 3(-2)^2-5*-2. so you square your -2 which gives you -4 so now you got 3*-4-5*-2. so now we do our multiplication and divsion. -12+10 and we get -2
3x^2 - 5x
when x=-2 we get
3(-2)^2 - 5(-2)
= 3(4) + 10
= 12 + 10
= 22
To evaluate the expression 3x^2 - 5x when x = -2, you need to substitute -2 in place of x and simplify the expression.
Let's go step by step:
1. Plug in x = -2 into the expression: 3(-2)^2 - 5(-2).
2. Evaluate -2 raised to the power of 2: -2^2 = 4.
3. Multiply 3 by 4: 3 × 4 = 12.
4. Multiply 5 by -2: 5 × -2 = -10.
5. Subtract -10 from 12: 12 - (-10) = 12 + 10 = 22.
Therefore, the correct answer is 22, not 46. So, your answer of 46 is incorrect.
To avoid confusion and errors when evaluating expressions, it's essential to follow the correct order of operations (PEMDAS/BODMAS) and accurately substitute values.