80.2k views
13 votes
Can someone help pls

Can someone help pls-example-1
User SKumar
by
7.9k points

2 Answers

7 votes

Answer:

x=5

Explanation:

Here,


2x^(2) +21=3x^(2) -4\\\\


21+4=3x^(2) -2x^(2) \\


x^(2) =25


x=√(25)


x=5

Let's check whether they are equal or not by putting the value of x.


2x^(2) +21


(2*5^(2)) +21


50+21


71


3x^(2) -4


(3*5^(2) )-4


75-4

→71

Hence they are equal.

User Sddamico
by
8.0k points
11 votes

Answer:

x = ± 5

Explanation:

for the figure to be an isosceles trapezoid

then the lower base angles must be congruent , that is

3x² - 4 = 2x² + 21 ( subtract 2x² from both sides )

x² - 4 = 21 ( add 4 to both sides )

x² = 25 ( take square root of both sides )

x = ±
√(25) = ± 5

User Robert Hyatt
by
8.7k points

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