The value of expression when 5x²- 2 when x=3 is

Mathematics

2 answers:

kati45 [8]3 years ago

3 0

Answer:

Step-by-step explanation:

Substitute x = 3 into the expression, that is

5(3)² - 2 = 5(9) - 2 = 45 - 2 = 43

Pavel [41]3 years ago

3 0

Solve by FactoringSolve with the Quadratic Formula solve by Completing the Square find Discriminant
Let's solve your equation step-by-step.
5x2−2x=3 Step 1: Subtract 3 from both sides. 5x2−2x−3=3−35x2−2x−3=0 Step 2: Factor left side of equation. (5x+3)(x-1)=0 Step 3: Set factors equal to 0. 5x+3=0 or x−1=0x=−35 or x=1
Answer: x=−35 or x=1

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Step-by-step explanation:

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3 years ago

I need some help with the question

vagabundo [1.1K]

To solve this you first need to turn your mixed numbers into improper fractions. to do this for $9 \frac{4}{5}$ you multiply the denominator (5) by the whole number (9) to get 45 and then add that to the numerator (4) to get your new fraction $\frac{49}{5}$ .

You repeat this process with $3\frac{1}{2}$ to get $\frac{7}{2}$ .

Now that you have two fractions you can multiply by the opposite reciprocal. To do this you flip the second fraction and change the division sign to a multiplication sign like so $\frac{49}{5} * \frac{2}{7}$