Question

(ii) If x = 2 and y = -2 then find the value of 7x2-3xy +5y2​

Answer 1

Question

if x = 2 and y = -2 then find the value of 7x^2 -3xy +5y^2

Answer

• we have to first food the values of x is equal to 2 and Y is equal to minus 2 into the equation

$= > 7 (2)^{2} - 3(2)( - 2) + 5( - 2)^{2}$

$= > 7 \times 4 - 3 \times ( - 4) + 5 {( 4)}$

$= > 28 - ( - 12) + 20$

$= > 28 + 12 + 20$

$= > 60$

Hence , the required answer is 60 .

Answer 2

Answer:

60

Step-by-step explanation:

7x^2-3xy+5y^2

7(2)^2-3(2)(-2)+5(-2)^2

7*4-3*-4+5*4

28+12+20

60