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=37²+2.37+1
=(37+1)(37+1)
=(38)(38) ..…...ini cara cepatnya dgn mengalikan 38 dengan 38
=1444
b. misalkan x=58, maka
58² +232 + 4
=58²+4.58+4
=(58+2)(58+2)
=(60)(60)........ini cara cepatnya dgn mengalikan 60 dengan 60
=3600
c. 27² - 100 + 4
=27² - 96
=27² - 2.27 -15 -27
=(27+3)(27-5) -27
=(30)(22) - 27 ........... ini cara cepatnya
=660-27
=633