Question

(3-a)(3+a)-a(8-a) при а=-5/8

Answer 1

Ответ:

Объяснение:

(3-a)(3+a)-a*(8-a)=9-a²-8a+a²=9-8a=9-8*(-5/8)=9+5=14.

Answer 2

Ответ:

4

Объяснение:  = 9-а² -8а + а² = 9 - 8а = 9 - 8 * 5/8 = 9 - 5 = 4

Answer 3

To evaluate the expression (3-a)(3+a)-a(8-a) when a = -5/8, simply substitute the value of 'a' into the expression and perform the calculations:

Step 1: Substitute a = -5/8 into the expression (3 - (-5/8))(3 + (-5/8)) - (-5/8)(8 - (-5/8))

Step 2: Simplify the expression with the given value of 'a' (3 + 5/8)(3 - 5/8) - (-5/8)(8 + 5/8)

Step 3: Continue simplification (24/8 + 5/8)(24/8 - 5/8) - (-5/8)(64/8 + 5/8)

Step 4: More simplification (29/8)(19/8) - (-5/8)(69/8)

Step 5: Multiply the fractions 551/64 + 345/64

Step 6: Combine the fractions (551 + 345) / 64

Step 7: Perform the addition 896 / 64

Step 8: Reduce the fraction (if possible) 14

So, when a = -5/8, the expression (3-a)(3+a)-a(8-a) evaluates to 14.