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3(x² -2x +3) -2(x² -5x -1) =
= 3x² -6x +9 -2x² +10x +2=
= x² + 4x +11
= (2)² + 4*2 +11=
= 4 + 8 +11=
= 23
b) a (2ab + b) -b ( a-2 ab + a^) = ? dla a=0,1 i b=(-10)
2a²b +ab -ab + 2ab² - a²b=
= a²b + 2ab²=
= ab(a + 2b)
= 0,1*(-10)*[ 0,1 + 2*(-10)]=
= -1*[ 0,1 - 20]=
= (-1 )*(-19,9)=
= 19,9
masz a) . chyba dobrze :)
3(4 - 4 +3) - 2(4 - 10 - 1) = 3*3 - 2 *(-7) = 9 + 14 = 23 * = razy
mam nadzieję,że mogłam pomóc